I'll just correct this single one: FYI, Emacs dates to the 1970s, long before GNU even existed.

'nuff said. "

From Wikipedia:

In 1984, Stallman began working on GNU Emacs to produce a free software alternative to Gosling Emacs; initially he based it on Gosling Emacs (...). It became the first program released by the nascent GNU project.

The original EMACS consisted of a set of Editor MACroS for the TECO editor. It was written in 1976 by Richard Stallman, initially together with Guy L. Steele, Jr..